Patent US2640428A successfully refreshed from Google Patents.
US2640428A
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Drive for fluid handling devices of the rotary, positive displacement type
Assignee: Dresser Industries Inc
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Filing: 1949-05-03
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Granted: 1953-06-02
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Expires: 1969-05-03
Abstract
No abstract record available.
Inventors
- 👤 Carl R Houghton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:31
CPC Classifications
F; F04; F04C; F04C18/00; F04C18/08; F04C18/12; F04C18/126; F04C15/00; F04C15/0057; F04C15/0061; F04C2/00; F04C2/08; F04C2/12; F04C2/126; F04C2240/00; F04C2240/40; F04C2240/402; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19623; Y10T74/1987; Y10T74/19893; Y10T74/19898
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |